#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    uint64_t a, b, c, t, p = 1000000007, z = 1;
    cin >> a >> b >> t;
    // (c/2)^t % p = (c/2 % p)*(c/2 % p)
    for(c = (a+b)/2; t > 0; t >>= 1) {
        if(t&1) {
            z = (c*z) % p;
        }
        
        c = (c*c) % p;
    }
    cout << z << endl;
    return 0;
}